diff --git a/scss/_forms.scss b/scss/_forms.scss
index b6a963e6c2..32836182c3 100644
--- a/scss/_forms.scss
+++ b/scss/_forms.scss
@@ -153,12 +153,24 @@ select.form-control {
   @include border-radius($input-border-radius-sm);
 }
 
+select.form-control-sm {
+  &:not([size]):not([multiple]) {
+    height: $input-height-sm;
+  }
+}
+
 .form-control-lg {
   padding: $input-padding-y-lg $input-padding-x-lg;
   font-size: $font-size-lg;
   @include border-radius($input-border-radius-lg);
 }
 
+select.form-control-lg {
+  &:not([size]):not([multiple]) {
+    height: $input-height-lg;
+  }
+}
+
 
 // Form groups
 //